Had a heart attack 15 days ago, in coma. Opened eyes, moved arms, legs, suspect brain damage. Suggestions ?

Hi! my brother had a heart attack 15 days ago and is in a coma now he has not respond but 3 days ago he start open his eyes and move his leg and arms the doctors suspect some brain damage but they dont know to what extent we were told that there is some brain activity so we are praying every day that he will pull out of this is only 56 years old and he does not deserve this , thanks